Start in a squat position, feet shoulder width apart, knees bent at or below 90 degrees (hips lower than knees), with dumbbells at shoulder level, keeping your elbows in. Push through your legs to stand up, keeping your back straight. When your legs are nearly straight, push the dumbbells straight upwards so that you finish in a standing position with arms straight above you. Then bring dumbbells back down to shoulder height, beginning your squat as you do so.